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Geographic, Customer and Supplier Information - Additional Information (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2013 Customer County | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting [Abstract] |  |  |
Geographic regions | 4 |  |
Top ten customers contribution of total worldwide revenue | 40.00% | 37.00% | 47.00%
Percentage of revenue contributed by one customer | 18.00% | 10.00% | 17.00%
Number of customers contributed | 10 |  |

X
- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Entity wide percentage of revenue by major customer percentage. + References No definition available. + Details
Name: | vdsi_EntityWidePercentageOfRevenueByMajorCustomerPercentage
Namespace Prefix: | vdsi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of geographical location. + References No definition available. + Details
Name: | vdsi_NumberOfGeographicalLocation
Namespace Prefix: | vdsi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of top revenue contributors. + References No definition available. + Details
Name: | vdsi_NumberOfRevenueContributors
Namespace Prefix: | vdsi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration